Yes aluminum will conduct heat more, especially because of its density as a metal. Im not that experience in the modifying game, but the plastics engineering field is HUGE! I doubt any car manufactuer would put on a part like the TMIC that its plastic wouldnt endure heat the engine is putting off. HOWEVER, the boost handling making it crack I can find being true. The metal used on the stock intercooler is very then and got bend and dented easly.
The Perrin (or any other aftermarket intercooler) is metal (most likely conducting slightly more heat, but you have to take into perspective that these are created to produce colder, and higher air intake pressures. The interior constuction of these are made to move the air "harder" (my word of choice?) through the intercooler to make it colder.
-Correct me if im wrong, It was just a though =P
I have the Perrin TMIC on my car, its a snug squeeze but I could hear even more from the turbo, I can definitly tell it was an increase in production.
Newtothegame: yes that is an ugly stock TMIC.haha. the plastic manifold makes me feel like my engine bay is like a "walmart" version.lmao!Laugh!
Chris - 2008 WRX sedan w/ vf52 setup now!